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Title:
ELECTRIC LINEAR ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2014/148514
Kind Code:
A1
Abstract:
Provided is an electric linear actuator comprising a mechanism for preventing the rotation of a threaded shaft, the mechanism having a simple structure and being of low cost. An electric linear actuator (1) is provided with a threaded shaft (10) having a helical thread groove (10a) formed in the outer periphery of the threaded shaft (10). A steel sleeve (17) is fastened to a closed-end hole (12) in a housing (2b) through a thread section (17b), and axially extending grooves (17a) having a substantially semicircular cross-section are formed in the inner periphery of the sleeve (17). Guide balls (15) are engaged with the grooves (17a) while also being engaged with an end of the threaded shaft (10). If the radius of the balls (15) is Ra, the curvature radius (R1) of the grooves (17a) is set to satisfy the relationship of R1 ≤ 1.2Ra. The threaded shaft (10) is supported so as not to be rotatable relative to the housing (2b) but so as to be axially movable.

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Inventors:
MIZUUCHI TAKAO (JP)
FUNADA KENSUKE (JP)
Application Number:
PCT/JP2014/057413
Publication Date:
September 25, 2014
Filing Date:
March 18, 2014
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD (JP)
MIZUUCHI TAKAO (JP)
FUNADA KENSUKE (JP)
International Classes:
F16H25/24; F16C17/02; F16C19/26; F16C33/10; F16C33/12; F16C33/64; H02K7/06
Domestic Patent References:
WO2013073692A12013-05-23
Foreign References:
JP2011117513A2011-06-16
JPS60189649U1985-12-16
JP2012082921A2012-04-26
JP2003247560A2003-09-05
JP2005186781A2005-07-14
JP2005263149A2005-09-29
JP2010025350A2010-02-04
JP2010190289A2010-09-02
JPH0480926U1992-07-14
Attorney, Agent or Firm:
KOSHIKAWA, TAKAO (JP)
Takao Koshikawa (JP)
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